Filtering apparatus.



gays. BROOKS & L. a. DUNCAN. FILTERING APPARATUS.

ABPucAnuu man nov. 1. ms.

Patented Sept. 18, 1917.

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fi ugg J 4 1 N l/VVE/VTUHS A TTOR/VEYS FILTERING'APPARATUS. APPLICATION FILED luv. 1. ms.

'PatentedSept. 18, 19171 12 SHEETS-SHEE'I 2.'

A 770mm e. s; BROOKS & L. e. DUNCAN. FILTERYING APPARATUS.

APPLkICATION FILED NOV. 1. 191? I gg tIVl/E/l/TORS s.g.\w

ATTORNEYS G. S.BR00KS&L.G.DUNC AN'. FILTERING APPARATUS. APPLICATION FILED moi. 1. me.

I 2 SHEETS- SHEET 4- COCO OOGO ATTORNEYS PatentedBept. 18, 1917.

a. s. unoox's & L. s. DUNCAN.

FILTERII IG APPARATUS. umcmou mgongov. i. 19w.

' Patentedse t'. 18,1917.

INVENTORS m M 0 U A A2 SHEETS-SHEEI 6. .7

G. s. BROOKS & L. G. DUNCAN.

FILTERING APPARATUS.

APPLICATION FILED NO V. I. I916.

PatentedSept. 18,1917.

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I I LLJ a 3/, r6? I, I

a 4| #1 1 I r 5 aILI IE'IIITORS I W ATTORNEYS G. S. BROOKS 8; L. G. DUNCAN- FILTERING APPARATUS.

1,240,305. I Mum?mum, PatentedSept. 18,1917.

v 12 SHEETS-SHEET a.

Mme/45m G. S. BROOKS & L. G. DUNCANJ e FlLTE-RING APPARATUS.

- APPLICATION FILED NOV. 1; 1916. 1,240,305.

Peteetea Sept. 155-1917.

I? SHEETS-SHEET 9.

INVENTORS W. ,ATTORNEYS G. S. BROOKS & L. G. DUNCAN.

HLTEBING APPARATUS.

i APPLICAT'ON FILED NOV.1\1916- 1,240,305. PatentedSept. 18, 1917.

12 SHEETS-SHEET l0.

e. s. BROOKS m. s. DUNCAN; FILTERENG APPARATUS.

1,240,305. I APPLICATION FILED NUV.I.I916- Patentedsepti 18,1917; I

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WIIIIII INVENTORS 5 3 AT/ORNEYS e. s. BROOKS & L. s. DUNCAN.

FILTERING APPARATUS. APPLICATION HI-ED NOV. l. 1916- 1 340,305 Patented Sept. 18, 1917.

v 12 SHEETS-SHEEI l2.

pi ea,

ATTORNEYS of Bureau, and

UNITED eras GEDRGE SAGE BROOKS AND LAWRENCE GRANT D'UNCfsQN, OE DEPUE, ILLINOIS,

FATE?! DFFICE.

ASSIGNORS TO NEW JERSEY ZINC COMPANY, NEVJ' YCRI'I, N. Y., A COB- IPORATION OF NEW JERSEY.

FILTERING APPARATUS.

Specification of Letters Patent.

Patented Sept. 18,1911

Application filed Novembei 1, 1516. Serial No. 128,872

To all whom it may concern:

Be it known that We, GEORGE SAGE Buooxs and LAWRENCE GRANT Duncan, citizens of the United States residing at Depue, county tate of Illinois, have in Vented certain new and useful Improvements in Filtering Apparatus; and we do hereby declare the following to be a full, clear, and exact description of the invention,

such as will enable others skilled in the art to which it appertain's to make and use the same.

This invention relates to filtering apparatus of the type employing a plurality of filte'ring bags of muslin or other suitable fabric into which air or other gas is forced so that as the gas passes through the meshes of the fabric of the bags, solid particles carried by the gas will be caught. Such filtering apparatus. is extensively used fol-removing :fine particles of zinc oxid, cement, flour and ;'ot her substances from air or other gases by which they are carried. In the operation of such apparatus, many of the particles caught by the fabric drop to the bottom oi the bag or to a receptacle to which the bag is connected, but many particles becomc'iodged upon the fabric of the bag and eventually the meshes of the fabric become so clogged that the gases do not pass through the fabric sufficiently freely.

Apparatus of this character has heretofore been provided with mechanism for shaking a bag at intervals inorder to dislodge the particles which have collected upon the fab Also, provision has been made in filric. tering apparatus of this general character forreversmg the direction of How of the gases conta ning the solid particles so that air passing through the meshes of-the filtering bags in the reverse direction will dislodgefrom the fabric the solid particles collected thereon. One of the features oi the present invention involves the provision of an apparatus wherein both of these cx 'icdicuts are combined so that after the use of the appa'atus has resulted in the collection oi solid particles upon the bags, the dn'cctmn of flow of gas through the fabric is reversed and at the same time the bags are shaken.

single mechanism and being actuated from a single source of power.

. The invention also includes the provision of an improved form of bag-shaking mechanism involving the cn'iployment of mechanical devices connected to the bags at a plurality of points distributed throughout their length throughwvhich the shaking of the bags is effected.- lhe motion of this shaking mechanism is such that the bag is collapsed more or less and expanded alternately in rapid succession, as the movement of the bag material thus produced is a close approximation of the movement incident to shaking the baghy band. This shaking motion is in'iparted to the bag by the mechanism employcd for supporting the bag in position. In the preferred form, it consists of two rods extending hingthwise of the bag and connected to opposite sides of the bag at a plurality of points, together with mechanism for. moving these rods toward and away from each other to collapse thebag and permit expansion thereof alternately. This movement of the rods may be conveniently elil cted by- 1; nk onnected to their ends and actuating mechanism these linlrs by a toggle motion to move the rods toward and away from each other. The bag may be supported in part by these rods 'lmt its principal support preferably consists operating throughof links connected to the upper portion of the bag at points displaced circlnnferentially of the bag from the points of connection of the rods thereto and in order to aid m securing the desired shaking movement of the are conveyed to the bags, whereby a single mechanism is operated in conjunction with the bag-shakin g mechanism, the valve being moved from one position to the other at the beginning of the bag-shaking movement and returned to its, original position at the end thereof. When the valve mechanism is in one position, the blower. acts to force the gases to be filtered into the bags under pressure and by merely changing the position of the valve mechanism, this operation of the blower. is' discontinued and instead theblower acts to draw 'the gases from'the bags and thus draw air into the bags from the exterior thereof through the meshes of the bag material, which are thereby cleared of the solid particles lodged therein. The valve mechanism is caused to assume this latter position and maintain it throughout the operation of shaking the corresponding ,bag or bags so that while the bags are being shaken, the draft through the bag material reversed. l urtl'iermore, by this arrange- 'nent. of the parts, a single blower will serve a plurality of filtering compartments, each provided with any desired number of bags.

Another feature of the invention involves the provision of a multiplicity of filter bags arranged in groups and automatic mechanism for shaking the bags of the several groups successively and each group independently of the several other groups. Preferably, a filter-bag house is provided divided into a number of compartments and in each compartment a. plurality of bags are installed. Each compartment is provided with its own power operated shaking mechanism for shaking all of the bags in that compartment simultaneously and a controlling mechanism is employed whereby the several shaking mechanisms of the several compartments are operated successively. By reason of this construction, the power necessary for shaking the bags need only be sutficient for shaking the bags of one compartment and also the operation of filtering the gases is not interrupted. as the operation continues in all of the several compartments except the one which is temporarily reversed relatively to the blower while the bags of that compartment are being shaken.

The invention also involves the provision of certain iniprovements in the ventilating system of a. bag house. to facilitate controlling the temperature around the bags. By properly regulating this temperature, the fabric ofthe bags is preserved. The filtering bags are of cmisidcrable length and are mounted in a vertical position within the bag house and the house or each of the sew eral compar ments therein is made in the form of a stack, the draft through which is controlled by suitable dampers arranged at either or both the inlets for air at the bottom of the stack or the outlets at the top.

These features oftlie invention and others whereby the bags are made easily accessible and visible for inspection, whereby the size of a filter house for a given filtering capacity is materially reduced, whereby the quantity of bag material required is reduced, whereby accurate shaking intervals are maintained, and whereby the presence of workmen within the filter house is made unnecessary except for special purposes,'will,be better understood by reference to the accompanying drawings which illustrate the preferred embodiment of the invention. It. will be understood, however, that the features of the invention are not limited to the construction illustrated in the drawings; on the contrary, the several features of the invention may be employed either individually or in conihination and in various forms diiiering widely as to their structural characteristics.

In the drawings, Figure 1. is a plan view of an installation of furnaces and filter houses and the connections between them; Fig. 2 is an elevation of one of-the filter houses and the power house connected thereto, the filter house being broken away in part; Fig. 3 is an end view of the filter house and power plant; Fig. 4 is a detail view of certain of the operating mechanism hereinafter referred to: F ig. 5 is a horizontal section through the filter house, the section line being the line of Fig. 2; Fig, 6 is a transverse section of the filter house; Fig. 7 is a transverse section showing the parts shown at the lower portion of Fig. (3 and those lying directly below them; Fig. 8 is a. detail view showing one of the doors through which the collected solid particles are removed; Figs. 9 and 10 together constitute a longitudinal sectional view of a portion of the filter house showing one of the compartments into which the house is divided; Fig. 11 is a detail view showing the valve controlling the admission of the gases to the filter bags of one compartment; Fig. 12 is a plan view of one compartment of the filter house showing the bags therein and the shaking mechanism therefor; Figs. 13 and 14 are sectional views showing one of the bags in its expanded and collapsed condition; Fig. 15 is an elevation of one of the intense it bags showing a portion of the shaking mech" anisni of the bag in section; 16, 17 and'IS are detail-views of portions olthe shaking mechanism; Fig; id is a sectional v pertinent; Fig.

view of the mechanism for controlling the shaking mechanism of one ot the compartments and operating the valve of that com 520 is a view of the electrlcal operating device for the mechanism shown 1 illustrates of the controller for several compartments;

of a portion of 1 Fig. 22; and Figs. 525 and.

house. The blowe f in Fig. 19; Fl 21 is a longitudinal section of the solenoid operatlng device shown in Figs. 19 and 20; Fig. 22 is a plan view Fig. 23 is a sectional elevation of. the mechanism shown in Fig. 22; Fig. 2a is a sectional. detail view the mechanism shown in 26 are detail views of the commutator shown in Fig.

Four 1 and tour bag Each furnace is by a line 3 and.

indicated at houses are llldlfiutfiil at 2. connected torts bag house ,these lines are preferably elon,tjated so that compartments, six in the prfiSBIlt instance,

and the flue 3 carrying the gases to that limp; house passes along" one side of the htnise. At the end of the house a blower is con.- nected in the line 3 for effecting the pa. of the gases tl'irough thellue and into the bags in the bag house. Beyond the blower the flue 3 is extended by a llue 5 which passes along'the opposite side of the baghouse. The blower is operated by a u'i'otor located in a power houseindicated at ti.

Figs. 2, 3 and 5 show the b house with the line 3 extending; along one ide oil it to the inlet port of the blower 'l and the line 5 extendin from the outlet "JOl't out the blower site side of the ban; Sl'lOWll as driven by'a -.d *within the power 6. The partitions dividing the liltcr house into cou'l nrrtnients are indicated at *Z'. a receptacle 8, the bottom of which termed by two inclined wallsforming a trough. Alt the bottom of this trough is an oititlet 9 7' and 10) provided with. a hinged gate .10

to and along the i which is liked to a rock shaft ll having a handle 12 thereon.

' 8 are mounted in an .the framework of the filter house so that a car 13 may pass under them on suitable rails The several receptacles elevated msition upon When the car under a rece fitacle, the gate 10 of the outlet of that receptacle may be movedby its handle 12 to; permit the solid particles which have collected in the solenoids of thean arrangement of fur vnacesand filter-bag houses which may be employed in producing zinc oirid. furnaces are adapted to contain land the lower side of that receptacle to pass downward into the car.

Each of the receptacles 8 is provided with two connections to the flue for carrying the gases to be filtered, these two connections leading to the flue on opposite sides of the blower. These two connections are indicated at it and 15 and they are shown best in Fig. 7. The connections or ducts Mextend out through the sides of the receptacles 8 and project under the flue 3 to which they are connected. .2. valve 16 is provided at the connection of each duct 14 to the fine 3, this valve being operated by a handle 17 which passes through a suitable stuiling box.

cop taclcs 8 and project over the extension 5 ot the line 8 to winch they are connected in.

a similar manner, a valve beingprovided at the point of connection to the fine as indicated. in Fig. 5. The inner ends of the ducts M- and. 15 overlap and openings are provided in the upper side of the duct 14 and the lower side of the duct 15, these two openings being in alinement. Avalve member 18 is provided as shown in Fig. 7 movable to the position in which it is shown in that figure tor closing the opening a position in which it closes the opening in the duct 15. Fig. 11 shows this valve incur parts associated therewith on ber 18 and the an ei'ilarged scale. As will be seen from that figure the upper side of the valve mom-- her is provided with an annular trouglrll-l a sealing means, such a l'u'piid powdered or pulverulent material, and armuid the opening of the d not 15 is a lip 20, which, when. the valve member 18 is raised, enters the trough 1.9. Also, around the opening in the duct 14: is an annular trough E ll adapted to contain a sealing means the valve member 18 provided with a lip or flange 22 adapted to enter the trough 21. it Will-beseen therefore, that, when the valve members 18' are in the ')osition shown in the Figs. 7 and 1.1, gases laden with solid particles may enter the receptacles 8 through the ducts .15 after l'iassing through the flue 3, blower l and flue 5 to the ducts 15. l/Vh'en the valvememhers 18 are raised to their upper positions,

in the duct 14 and to littlthese connections from the line 3, through the blower line 5 and tacles e, are closed end the receptacles 8 are connected to the flue 3 by the ducts 141-. ln

ducts 15 to the recepother words, the connections from the line 3- I blower, Whereas the connections length. In the present instance, thirty-two bags are shown as Inent, these being arranged in four rows of eight each. All of the bags are closed at their upper ends and their lower ends are fitted over and bound to the upper ends of short lengths of tubing 23 passing through the top walls of the receptacles 8. Extending across the top of each compartment are four pairs of beams 24, each pair constituting the supporting structure for one row of eight bags and the shaking mechanism for;

' ment of the bags in a compartment and this figure also shows the pairs of beams 24 overlymg the bags of a row and the rod 25 from which the bags are suspended. This rod 25.

extends parallel to the beams 24 and lies over the center of the, space between them.

On opposite sides of each rod 25 are two rods 26, each connected at each of its ends to the rod 25 by a lever 27. Each lever 27 is pivotally mounted upon one of the beams 24*. by

' means of a standard 28 mounted upon the beam 24-. and having the lever 27 pivoted I therein. These parts constitute two rectaneyes 33 secured to the bag 31 rocking frames. is connected ular frames pivotally connected at their ktdJEtCQ-Hiledges and each pivotally mounted upon one of the beams 24. Figs. 15 and '17 show this mechanism onan enlarged scale. The levers 27 are shown in these figures pivotally mounted in the standards 28 which are secured upon the beams 24: and at their outer'ends the levers 27 carry the rods 26. The inner ends of the levers 27 are biturcated and straddle the rod 25.. This rod is adapted to are rocked and it is guided in its vertical movement by vertically disposed slots in standards 29 which are secured upon the beams 2d. Fig. 15 shows one of the links 30 by which the bag 31 is suspended from the rod 25. i 1 v A pair of rods 32 extend along opposite sides of the bag 31 at points 90 displaced from the points of-attachment of the links 30 to the bag 31. These rods 32 pass through at intervals throughout the length of the bag. At its upper end each rod 32 is connected by a link 34; to the overlying rod 26 of one of the At its lower end each rod by a link 35 to a stationary portion 36 of the supporting structure, a turn-buckle being'provided in this (101111263- tion for adjusting its length. It will be provided in each co-mpartlowering of the links move vertically asthe levers 27 noted that the links 32L and 35 and the rods 32 together with the rocking frames, con stitute toggles such that when the frames are rocked to raise the rods 26, the parts 3et, 32 and 35, will be brought more nearly into alinement; inother words, the two rods 32 of the bag 31 will be moved away from each other, thus drawing the bagout to a collapsed condition such as is indicated in Fig. 14.. At the same time that the rods 26 are raised to cause this collapse of the bag, the rod 25 is depressed, thus lowering the links 30 and the portions of the bag to which those links are connected, and in this way facilitating the collapse of the bag. \Vhen the rocking frames are rocked in the opposite direction, the links 30 are raised and the 34 permits the rods 32 to move toward each other whereupon the bag is expanded so as to assume its original condition.

The two rectangular frames including rods 25 and 26 which the shaking of-the bags 31 are rocked in one direction by springs acting to draw the rod 25' downward and in the other direction by a power shaft acting to raise the rod 25 against the tension of these springs. For this purpose each rod 25 has two springs 37 connected to it and extending downward from it, as shown in Figs. 6, 16 and 18. Each spring 37 extends through a tubular guide 33 depending from a and 18) extending between the beams 24. The end of spring 37 is connected to a few chain links and a bar 41 extends through one of these links to anchor the spring to the end of the tube 38. The chain links provide means for adjusting as desired.

For raising each rod 25 against the tension of its springs 37, two bell crank levers 40 (Figs. 6 and 16) are provided pivoted in standards 29 mounted upon the beams these bell crank levers nected by a link &2 to the rod 25. The opposite ends of the bell cranks 40 are connected by links 43 to crank arms 44: upon a rock shaft 4:5. Thus, when the shaft 45 is rocked in one direction, the two connections 44, 43, 4O, 42, from the rock shaft 45 to the rod 25 operate toraise the horizontally disposed rod 25 vertically two rectangular frames consisting of rod 25, the two rods 26 and the four pivoted levers 27. Then, when the means for rocking the the tension of spring 37 24. Each of 40 has one end conthus rocking the are movable to effect bracket 39 (Figs. 15

shaft 45 in that direction releases the shaft,

the rod 25 is pulled downwardly by its springs 37, thus actuating the parts 42, 40, 13, 44 and 45 in the opposite direction. For rocking the shaft l5, the latter is provided with an arm 46 adapted to be engaged by a bait 4'8. From Fig. the shape of this cam cam 47 on the power s 6, it will be seen how 47 and the cooperation oil the cent with the arm 46 serve to roelr theshaiit to end rnise rod 25, and thereafter permit the rod 125 to be lowered, restoring sheitt to its tor-- mer position. v

The power shaft 1-8 extends lengthwise ot the filter house the entire len h thereott. Its end pi ejects through the end wall. ot the filter house, es shown. in-l ige. El, 3 and ll, and carries z. sprocket wheel l9. 'll'his wheel and the shaft l8 are driven by a chain. 50 which runs on a sprocket"wheel on, a countershaft 51. Another 'oclret wheel onthie counter-shaft reeeiv s e ohnin til-l which also runs on e sprocket wheel 5; shown in. nil in Fig. l. The shaft list out this sprocket- Wheel carries-e 'wori'n wheel 55 which meshes with a worm on a she" 56 carryinge sproelret 57. 'lhissproelret is driven lay a chain 5d (Fig. '5) from a sprocket wheel on the shaft of the blower. The shaft also carries a sprocket wheel 59 whic 1 receives a chain lit) for driving a shalt (:51 ot the commutator ash'erelnatter described. lily metres of these.

connections, the power shaft l8 extending len 'thwlse of the filter house shine the to i thereof is rotated continuously whenever the blower is in operation, that is, whenever the which enacts with the a ton is provided upon the roll 1 filtering apparatus is in use.

Normally, the rock left d5 is a position that its arni ll does not come in contact with the earn t? as the latter rotates. lVhen it is desired to shake the bags oil a. compartment, the rod oi. thet compare ment is released, and i drown downward. hjv

its springs 3i, thus aetinp; through. the parts a nd hatt

4:2, 40, 43 and :l -l to root: the e carry the arm it? down into en cam il". ln order to hold arin l-li in its inop erative position, that own extended to the other side of shaft end cooperates withan edgustahle stop on a rod 652 whiel'i extends down to the base oil the compartment and carries the valve;.rnernher .lfl. This rod is provided with a cross-head 63 end a pair oi. springs 64: are connected at upper ends to this cross-head and at tl r lower e: one of the fran'ie lnei'nl lo compartment so that the really not to draw the rod (it! When they do so, they not i 46 to rock shaft lh and r against the tensirv 'l ol' rod'62 has a turn-inn ing its length and tin able so that pro shaking nieohnn that the rnagniti if 1 sln merit efl'eeted by from ll end r. be adjusted as desi.

In order to niov against the tension ot its e r pen ent held in such no meet with i th root :trom cross hraees Stisecured at their ends to two Oil the'ltiean'is 24 as shown in Figs. 6, 9 and The detiiils of this piston and cylin derainl the parts associated therewith are best shown in. Figs. 19, 20 and 21. The piston. is shown at secured to the rod in) and. movable within the cylinder 6!. is eotuated by llnid under pressure supplied thereto from a. supply pipe 67. From this D ipe, a pipe (38 leads to the bottom, of the cylinder and in this pipe is a valve 69, the movable member of Whiclris normally held upon its seat by a spring. The valve member of the valve may he raised. from its seat hy upward movement of the stern W of the valve which projects out through the valve casing. For permitting the exhaust of the aetm ting tluid from the lower end ot the cylinder 65, the pipe 68 is provided, with a hraqneh pipe 'l'll having a valve 7:? therein. The .n'iovahle meinherot this valve is else held normally upon its seat by a spring and. th valve member may he moved from its y downward pressure upon the stem l8 oil' the valve. .ln the drawings, the pipe 7]. shown connected to the upper end oi the cylinder to provide for the transfer of the actuzntinp; tluid troin one end of the cylinder to the otl'ier. However, when ooinpressed err is used as the actuating fluld, the

" pipe ll leading to-the upper end of the cylphere. llor actuating thetwo valves 69" end 7'2, u solenoid 74: is provided. The core '35 of thissolenoid is normally drawn downward by a spring 76 connected. thereto and when so drawn downward the core enthe stem 73 of valve 75! so to-hold t valve open. Under such cireuinstances the rod (lit ,rawn downward by its springs ti l to the position in which the valve 1116111 her 18 is lowered to its Fig. 6 position-and The piston y llti .ltlll lllll in which the hagshalring nieohanisinis held.

'inoperative. lln order to actuate'the valve 'hanisrn, the solenoid 74: is .en- (l is hereimictter (ilescrihed and operates i tl'ie core 75. l l hen the core is so 1 min s the stem 70 of the valve til op a t .a valve and disengages the stern i l-l o'l vn lve l2 so as to allow that valve to llnder these conditions fluid under ."t'roin the supply pipe 6? lve 67) anrl. pipe 68 to the lower i .i oral. o'l ovl and *wi h it the rod. es. This moves the valve 'ltl from its lower to upper position. end rt the sloshing mechaler es and. raises the piston 66 .llllti complished by means of the mechanism nism so that the latter is operated by the 7 combined action of the springs 37 and the power shaft 48.

The bag shaking mechanism above described, together with the actuating mechanism shown in Figs. 19, 20 and 21, and the valve member 18 movable at the beginning and at the conclusion of the bag shaking operation, are provided in each of the several compartments of the filter house. As above stated, in the present instance the filter house includes six of these compartments, each provided with thirty-two bags.

It would be undesirable to effect the shaking of all the bags in the filter house at once as that would involve discontinuance of the I filtering operation temporarily and .7 also would require a considerable amount of power. Provision is therefore made in the apparatus illustrated in the drawings for operating the shaking mechanism of the several compartments successively so that the power required need only be sufficient. .tor operat ng one shaking mechanism and so that while the bags of one compartment are being shaken, the filtering operation will proceed in all the other compartments. The operation of any shaking mechanism is dependent upon the energization of the sole noid 7% corresponding thereto and therefore means are provided for so closing the cir cuits through the solenoids 74 of the several compartments that no two of these may be closed at the same time. Preferably, a controller or commutator is employed for this purpose and. so arranged that the solenoids 74. of the several compartments will be closed in, a regular succession with the desired time intervals between and held closed for the desired length of time. This is acshown in Figs. to 26. In these figures a controller or commutator cylinder '77 is provided having a plurality of lengthwise grooves therein each of which is adapted to receive a commutator segment 78. These segments 78 are adapted to be secured in end of each arm 80 is normally held up by a spring. 81 (Fig. 23) to hold the opposite end of the arm down upon the. surface of the cylinder 77 and the passage of the segment 78 corresponding to that arm under the end of the arm serves to rock the arm der 77 is rotated, circuit is closed by the segments 78 through one after another of the circuits of the solenoids 7 1 and each of these circuits when closed is held closed for a definite length of time, depending on the width of the segments 78 and thespeed of rotation of the cylinder 77. \Vhen any solenoid circuit is closed, the shaking mecha nism of the compartment to which that solenoid corresponds is set in operation and its operation is continued until the circuit is broken by the passage of ther segment '78 from under the end of the arm 80.

As will be noted from Figs. 2, 3 and 5, the portion of the filter house inclosin'g' the bags is a closed structure except for inlet openings at the lower end thereof and outlet openings at the top. One or more outlets, 87 are provided at the center of the roof and along the top of each side wall are a. plurality of openings provided'with hinged doors 88. The openings at the lower end of the bag compartments are indicated .at 99 in Figs. 3 and 7. Each compartment of the filter house is provided with. a door 98 through which access may be had to the interior. r

The various parts of the apparatus through which the gases to be filtered pass are provided with. numerous openings and closures therefor, so that the solid particles collecting therein may be readily obtained and the parts of the apparatus suitably cleaned. Thus, the fiue 3 and its extension 5 are shown as provided with doors S9 at intervals throughout their length. Each of the ducts 14 and 15 is also provided with a door at itatouter end. A construction which may be employed for such a door is shown in Fig. 8. The door 9Q is rectangular in shape and is adapted to fit over a rectangular opening in the end of the duct 14. The door is held in position firmly against its seat by means of a rod 91, the ends of which are adapted to coiiperate with inclined walls upon blocks 92 secured to the door frame. 7 In this Way the door may be readily held upon its seat so tightly as to prevent the air around the door from entering, a suitable packing heing preferably provided between the edge of the door and its seat. Each of the receptacles 8 is alsb provided with doors 93 at its ends, as shown in Figs. 7 and 10. Y

Preferably, the filter house structure in cludes galleries arranged as indicated in the drawings to give ready access to the dii'glerent portions of the apparatus and particularly to the doors through ivhichthe Withdrawal of collected solid particles is etl'ectedl shown. in lilg. 3, gallerles 94: and 9513 are -prorided extending along the sides oil the ed below the fine 3.

lilter house'ahove the lines 3 and'li l roi n the gallery Ell a second gallery 96 is suspend.-

structed Will now he described. 1 The lurnaces shown in Fig. l supply'luines carry- Within the bags.

solid particles to the l lues 3 Where the and particles are cooled and through which the, gases and particles are caused to flow hy the blowers l: towhich the lines in o are connected. These blowers force the gases through the extensions a of the lines '3 and through-the ductslfi into the receptaelse 8 oil the filter houses and upthrough the connecting tubes 23 to the bags Under normal operating conditions, the "valve member 18 or each receptacle is in its lowermost po sition closin the openingfrom the duct let to the receptac e 8 and opening the outlet from the duct into the receptacle 8. llhe gases therefore enter the receptacles 8 through theducts 15 under a light pressure created hy the blower and pass up into the bags, the

gases passing outward through the bags and the particles carried thereby being retained While the apparatus is in operation, the rotation of the blower causes slow rotation of thecylinder ll of the controller. Therefore, at angular intervals throughout the operation of the apparatus the controller effects the-closure of the circuit of one of the solenoids 7t and holds this circuitclosed for a definite length of, time.

l l hen the circuit of any solenoid is closed, the core oi. that solenoid is raised against the tension of its spring l6, thus opening the valve 69 and permitting the closure of the valve 72. When this occurs, fluid under n'essure from pipe 67 throughvalve so and pipe 68 t0 the lowerend of the cylinder oliand it acts upon the piston 66 to raise that piston and the rod 652 "to which it is: connected. The raising; of rod 6% thus i inst the tension oil its springs, till: *arrios the valve inemher 18 from its lower position, closing the openings to .cluct i l, to its upper positioin closing the opening to duct 'i lllhus, the passage through which the gases are su'i plied to the receptacle 8 and ha slll hy the blower a is closed but a passage unlepcndent oi? the blower is provided 'lroin the y Way oil the duct reeeptacle 8 to the tlue 3 h l-l, Also the raisin of rod 69; releases the- A gallery 97 is sus-i i eaoeoa arm alti on the rock shaft lli so that the spring W are free to roclr the four frames each consisting, of a rod 25, rods 26 and piv-' This rocking movement efitected hy springs 37, is a downward move oted levers connected. .lls the rods. 26 move upward,

the links 34 suspended therefrom are drawn up, resulting in moving the parts 34, 32 and more or less. into alinement and moving. the rods its this movement occurs, the shaft,

3? of each hag away from eachv other. is rocked, carrying the arm 46 down upon the periphery of earn l7, which cam is continuously rotated by the shaft 48. The rotation Oil the cam therefore acts through the parts to, to, all, l3, l0 and -12 to rock-the" time of the parts 25, 26 and 27,

of each hag may more toward each other.

This action tallies place rapidly in corre-v spondence with the rotation of the cam 47,-

the movement in one direction being effected hy. the springs-Eli and the movement in the other direction being effected by the cam 47 and power shaft 48. Thus, each bag is subjected to repeated'collapse and expansion by means of mechanical devices connected to the, bag and serving as the supports for the hugs The toggle action of the mechanism causes the rods 32 connected to opposite sides oi? the to move away from each otherand." this movement takes place, the connections to the has; at points intermediate oil the rods 352 are related so that these connec' tions to the has; will not oppose the collapsinn movement oil the bag. The bag; therefore collapses to a condition approximating that indicated in Fi e, 14. Then on reversal of the movement of the parts the rods 32 are'perinitted to approach each other and at the same time the connections through the links 30 to points on thehag intermediate the rods 39 are d rawn up so that the hagis once more caused to assume a substantially circular condi ion, as shown in Fig. 13. The shitting o'li tl ieinher 18 immediately prece ing the 1g of the bags-seas to cut oil the connect an to the bags through the duct l5 and establish connection to the he :hroupgh the duct ll. changes the conthat the latter, instead of forcing gasesvladen with solid particles into the bags, acts to draw the-go, in the bags out through the duct let and into the line. In other Words, the direction of allow Within the bags is re versed and air is drawn through the meshes one hetrw 3D. the bangs and the blower so of the bags from the outside thereof so as to assist in dislodging solid particles which have collected upon the bags. This reversalv of the direction of flow through the bags continues throughout the period of operation of the shaking mechanism so that the dislodging of particles collected upon the bag is effected by the joint action of shaking the bag naterial and causing the flow of air from the outside of the bag to the interior thereof. The meshes of the bag material are thereby cleared of solid particles thoroughly and in very short time. Furthermormthe relieving of the pressure within the bag by this change of the connections between the blower and the bag facilitates the shaking operation since the bag is thus enabled to collapse more freely. The shaking operation is repeated as long as the energization of solenoid H is continued and when the circuit of the solenoid is opened, the springs 64: together with the weight of the rod 62 and the parts carried thereby cause the rod.

and the piston 66 to move downwardly.

This movement of the rod and piston is per-.

I mitted because, when the solenoid is de'elnergized the core drops, resulting in closure of valve 69 and opening of valve 72; the compressed fluid in the lower end of plston 65 may then escape or pass into the upper part of the cylinder through pipe 68, valve 7:2 and pipe 71. This downward movement of-rod 62 acts through arm 46 to rock the shaft 45 and raise the rod 25 and hold the latter in the raised position, the tension of springs 37 being overcome by the tension of springs G-i and the weight of rod 62. Also, this downward movement of rod 62 carries the valve member 18 to the position for open-' ing the duct 15 and closing the duct 1e, whereupon the suction of gases from the. bags through the duct 14 is discontinued and the gases are forced by the blower through the duct 15 into the bags and the filtering operation continues as before. Thereafter, the rotation of the controller cylinder closes circuit through the solenoid of the next compartment and the shaking operation, together with the reversal of the flow through the bags of that compartment, are repeated therein in the manner above described. The operation continues thus in the several compartments in succession tliiroughout the pe-, riod of operation of the plant each shaking mechanism being operated for a definite time and the filtering operation being continued in all of the compartments other than the one in. which the shaking mechanism is be ing operated and in which the direction of fiow through the bags is reversed. The valves '16 controlling the connections of the ducts 14 and 15 to the flue 3 and its extension 5 are normally more or less open, the positions of these valves being controlled by their handles 17 which pass through times for inspection.

stuffing boxes to positions convenient for their manipulation. These valves may be adjusted to a more or less open position so as to establish the desired conditions of! pressure and suction in the bags of each compartment. Also, it will be noted that the construction of the valve member 18 and its cooperating parts is such that a gas tight closure is effected in each of the two positions of this valve member. The stem of the valve member, that is the rod 62, passes through a stuffing box at the top of the duct 15, as is indicated in Fig. 11.

It will be noted that each of the several compartments is completely closed except for inlet openings 99 at its lower end and outlet openings at the top controlled by desired by opening the doors 88'1nore or less.

In this way the desired temperature within the bag compartments and around the bags may be readily obtained; the maintenance of the proper temperature is of importance as the bag material deteriorates much less rapidly when proper temperature This upward movement of theair may be controlled as conditions within the bag compartments are maintained.

It will be noted that the arrangement of the fines and ducts is such that a single blower may serve all of the several compartments of a filter house and that blower both forces gases into the bags and sucks gases from the bags. When any set of bags is being shaken, the blower is so connected to those bags as to draw gases therefrom and at the same time it. is forcing gases passing through flue 3, as well as those drawn from the bags-under suction, through the extension 5 of the flue 3 to the bags wherein the filtering operation is being continued. It will be noted also that the bags are readily accessible and are visible at all Furthermore, the tiltering material is used to such good advantage that with the construction herein described a material reduction is effected in the quantity of bag material necessary for a given filtering effect as well as in the size of the filter buildings. Furthermore, this construction is such that it is unnecessary for workmen to enter the filter house except for purposes of inspection or repair, such, for instance, as when it becomes necessary to change a bag or readjust parts of the apparatus. it will be noted also that the appa ratus is such that accurate shaking intervals are maintained and the duration of the shaking operations is always the same. The time of the shaking operation and the intervals between successive operations may 

